JP5995439B2 - Power transmission device - Google Patents

Power transmission device Download PDF

Info

Publication number
JP5995439B2
JP5995439B2 JP2011287229A JP2011287229A JP5995439B2 JP 5995439 B2 JP5995439 B2 JP 5995439B2 JP 2011287229 A JP2011287229 A JP 2011287229A JP 2011287229 A JP2011287229 A JP 2011287229A JP 5995439 B2 JP5995439 B2 JP 5995439B2
Authority
JP
Japan
Prior art keywords
clutch
pressure
resistance
power transmission
transmission device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2011287229A
Other languages
Japanese (ja)
Other versions
JP2013137039A (en
Inventor
健一郎 磯部
健一郎 磯部
成城 川島
成城 川島
慎二 古橋
慎二 古橋
安藤 剛
剛 安藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FCC KK
Original Assignee
FCC KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2011287229A priority Critical patent/JP5995439B2/en
Application filed by FCC KK filed Critical FCC KK
Priority to EP12863436.7A priority patent/EP2799734B1/en
Priority to BR112014016210-7A priority patent/BR112014016210B1/en
Priority to IN1278KON2014 priority patent/IN2014KN01278A/en
Priority to PCT/JP2012/084079 priority patent/WO2013100130A1/en
Priority to CN201280064286.9A priority patent/CN104011416B/en
Publication of JP2013137039A publication Critical patent/JP2013137039A/en
Priority to PH12014501274A priority patent/PH12014501274A1/en
Priority to US14/317,240 priority patent/US9371867B2/en
Application granted granted Critical
Publication of JP5995439B2 publication Critical patent/JP5995439B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00Friction clutches
    • F16D13/22Friction clutches with axially-movable clutching members
    • F16D13/38Friction clutches with axially-movable clutching members with flat clutching surfaces, e.g. discs
    • F16D13/52Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member
    • F16D13/54Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00Friction clutches
    • F16D13/22Friction clutches with axially-movable clutching members
    • F16D13/38Friction clutches with axially-movable clutching members with flat clutching surfaces, e.g. discs
    • F16D13/52Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member
    • F16D13/54Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member
    • F16D13/56Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member in which the clutching pressure is produced by springs only
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00Friction clutches
    • F16D13/22Friction clutches with axially-movable clutching members
    • F16D13/38Friction clutches with axially-movable clutching members with flat clutching surfaces, e.g. discs
    • F16D13/52Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member
    • F16D13/54Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member
    • F16D13/56Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member in which the clutching pressure is produced by springs only
    • F16D2013/565Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member in which the clutching pressure is produced by springs only with means for releasing the clutch pressure in case of back torque
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00Special features for couplings or clutches
    • F16D2300/22Vibration damping

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Description

本発明は、任意に入力部材の回転力を出力部材に伝達させ又は遮断させ得る動力伝達装置に関するものである。   The present invention relates to a power transmission device that can arbitrarily transmit or block the rotational force of an input member to an output member.

一般に自動二輪車が具備する動力伝達装置は、エンジンの駆動力のミッション及び駆動輪への伝達又は遮断を任意に行わせるためのもので、エンジン側と連結された入力部材と、ミッション及び駆動輪側と連結された出力部材と、出力部材と連結されたクラッチ部材とを有しており、複数形成された駆動側クラッチ板と被動側クラッチ板とを圧接させることにより動力の伝達を行い、その圧接力を解放させることにより当該動力の伝達を遮断するよう構成されている。   In general, a power transmission device included in a motorcycle is used to arbitrarily transmit or cut off the driving force of an engine to and from a driving wheel. An input member connected to the engine side, and the transmission and driving wheel side An output member coupled to the output member, and a clutch member coupled to the output member. The drive side clutch plate and the driven side clutch plate, which are formed, are pressed against each other to transmit power, and the pressure contact is achieved. The transmission of the power is cut off by releasing the force.

より具体的には、従来の動力伝達装置は、例えば特許文献1にて開示されているように、入力部材の回転と共に回転し複数の駆動側クラッチ板が形成されたクラッチハウジングと、クラッチハウジングの駆動側クラッチ板と交互に形成された複数の被動側クラッチ板と、出力部材と連結されたクラッチ部材と、クラッチ部材の軸方向に移動が可能とされつつ当該クラッチ部材に取り付けられ、クラッチ部材に対する軸方向への移動に伴い駆動側クラッチ板と被動側クラッチ板とを圧接させ又は圧接力を解放させ得るプレッシャ部材とを具備し、駆動側クラッチ板と被動側クラッチ板との圧接又は圧接力の解放により、入力部材に入力された回転力を出力部材に伝達し又は遮断し得るよう構成されている。   More specifically, as disclosed in, for example, Patent Document 1, a conventional power transmission device rotates with the rotation of an input member to form a plurality of drive-side clutch plates and a clutch housing. A plurality of driven-side clutch plates formed alternately with the drive-side clutch plates, a clutch member connected to the output member, and attached to the clutch member while being movable in the axial direction of the clutch member. A pressure member capable of pressing the driving side clutch plate and the driven side clutch plate or releasing the pressing force with the movement in the axial direction, and the pressure contact or pressing force of the driving side clutch plate and the driven side clutch plate. By the release, the rotational force input to the input member can be transmitted to or shut off from the output member.

特開2010−223296号公報JP 2010-223296 A

しかしながら、上記従来の動力伝達装置においては、例えばニュートラルで車両を停止させた状態において、エンジンから伝達される振動等によりプレッシャ部材がクラッチ部材に対して相対的に回転する方向に振動してしまうことがある。すなわち、プレッシャ部材は、通常、クラッチスプリング等によって軸方向の振動が制限されるものの、回転方向の振動については規制されていないのである。しかして、プレッシャ部材がエンジンの振動等によって回転方向に振動すると、動力伝達装置の構成部品が相互に干渉等してしまい、異音が生じたり操作性に違和感を与えたりする虞があった。   However, in the conventional power transmission device, for example, when the vehicle is stopped in a neutral state, the pressure member vibrates in a direction rotating relative to the clutch member due to vibration transmitted from the engine or the like. There is. In other words, the pressure member is normally not restricted for vibration in the rotational direction, although the vibration in the axial direction is limited by a clutch spring or the like. Therefore, when the pressure member vibrates in the rotational direction due to engine vibration or the like, the components of the power transmission device may interfere with each other, which may cause abnormal noise or give an uncomfortable feeling to the operability.

本発明は、このような事情に鑑みてなされたもので、プレッシャ部材のクラッチ部材に対する相対的な回転を抑制することにより、同方向の振動を抑制することができる動力伝達装置を提供することにある。   This invention is made in view of such a situation, and provides the power transmission device which can suppress the vibration of the same direction by suppressing relative rotation with respect to the clutch member of a pressure member. is there.

請求項1記載の発明は、入力部材の回転と共に回転し複数の駆動側クラッチ板が取り付けられるクラッチハウジングと、前記クラッチハウジングの駆動側クラッチ板と交互に形成された複数の被動側クラッチ板が取り付けられるとともに、出力部材と連結されたクラッチ部材と、前記クラッチ部材の軸方向に移動が可能とされつつ当該クラッチ部材に取り付けられ、クラッチ部材に対する軸方向への移動に伴い前記駆動側クラッチ板と被動側クラッチ板とを圧接させ又は圧接力を解放させ得るプレッシャ部材と、前記入力部材に入力された回転力が出力部材に伝達され得る状態となったときに前記プレッシャ部材及び前記クラッチ部材が相対的に回転して近接することにより前記駆動側クラッチ板と被動側クラッチ板との圧接力を増加させ得る圧接アシスト用カム、または出力部材の回転が入力部材の回転数を上回ったときに前記プレッシャ部材及び前記クラッチ部材が相対的に回転して離間することにより前記駆動側クラッチ板と被動側クラッチ板との圧接力の解放を行わせるバックトルクリミッタ用カムとを有し、前記駆動側クラッチ板と被動側クラッチ板との圧接又は圧接力の解放により、入力部材に入力された回転力を出力部材に伝達し又は遮断し得る動力伝達装置において、前記プレッシャ部材が前記クラッチ部材に対して相対的に回転する際、当該プレッシャ部材に対して摺動抵抗を生じさせる抵抗部材を具備したことを特徴とする。 According to the first aspect of the present invention, a clutch housing that rotates with the rotation of the input member and is attached with a plurality of drive side clutch plates, and a plurality of driven side clutch plates that are alternately formed with the drive side clutch plates of the clutch housing are attached And a clutch member coupled to the output member, and attached to the clutch member while being movable in the axial direction of the clutch member, and being driven by the drive-side clutch plate and the driven member as the clutch member moves in the axial direction. A pressure member that can press-contact the side clutch plate or release the pressing force, and the pressure member and the clutch member are relative to each other when the rotational force input to the input member can be transmitted to the output member. The pressure contact force between the drive side clutch plate and the driven side clutch plate can be increased by rotating and approaching When the rotation of the pressure assisting cam or the output member exceeds the rotational speed of the input member, the pressure member and the clutch member relatively rotate and separate, thereby causing the drive side clutch plate and the driven side clutch plate to A back torque limiter cam for releasing the pressure contact force, and the rotational force input to the input member by the pressure contact force or release of the drive side clutch plate and the driven side clutch plate to the output member. In the power transmission device capable of transmitting or blocking, the power transmission device includes a resistance member that generates a sliding resistance with respect to the pressure member when the pressure member rotates relative to the clutch member. .

請求項2記載の発明は、請求項1記載の動力伝達装置において、前記プレッシャ部材及びクラッチ部材は、軸方向に嵌合面を有するとともに、当該プレッシャ部材又はクラッチ部材の嵌合面に前記抵抗部材が配設されたことを特徴とする。 According to a second aspect of the present invention, in the power transmission device according to the first aspect, the pressure member and the clutch member have a fitting surface in an axial direction, and the resistance member is provided on the fitting surface of the pressure member or the clutch member. Is provided.

請求項記載の発明は、請求項1記載の動力伝達装置において、前記プレッシャ部材又はクラッチ部材における当該プレッシャ部材とクラッチ部材との軸方向の合わせ面に前記抵抗部材が配設されたことを特徴とする。 According to a third aspect of the invention, the power transmission device according to claim 1 Symbol mounting, said resistor member to the mating surface in the axial direction of the said pressure member and the clutch member in the pressure member or the clutch member is disposed Features.

請求項記載の発明は、請求項1記載の動力伝達装置において、所定寸法を超えて前記プレッシャ部材が前記クラッチ部材に対して離間する方向に移動するのを規制する規制部材を具備するとともに、前記抵抗部材は、前記プレッシャ部材に配設されて当該規制部材の表面を摺動可能とされたことを特徴とする。 The invention of claim 4, wherein, in the power transmission device according to claim 1 Symbol mounting, together with the pressure member exceeds a predetermined size comprises a regulating member for regulating the movement in a direction away from the said clutch member The resistance member is disposed on the pressure member and is slidable on the surface of the regulating member.

請求項1の発明によれば、プレッシャ部材がクラッチ部材に対して相対的に回転する際、当該プレッシャ部材に対して摺動抵抗を生じさせる抵抗部材を具備したので、プレッシャ部材のクラッチ部材に対する相対的な回転を抑制することにより、同方向の振動を抑制することができる。   According to the first aspect of the present invention, since the pressure member is provided with the resistance member that generates sliding resistance when the pressure member rotates relative to the clutch member, the pressure member relative to the clutch member is provided. By suppressing typical rotation, vibration in the same direction can be suppressed.

また、入力部材に入力された回転力が出力部材に伝達され得る状態となったときにプレッシャ部材及びクラッチ部材が相対的に回転して近接することにより駆動側クラッチ板と被動側クラッチ板との圧接力を増加させ得る圧接アシスト用カム、または出力部材の回転が入力部材の回転数を上回ったときにプレッシャ部材及びクラッチ部材が相対的に回転して離間することにより駆動側クラッチ板と被動側クラッチ板との圧接力の解放を行わせるバックトルクリミッタ用カムを具備したので、エンジン等の振動が伝達されてプレッシャ部材が回転方向に振動し、当該振動がクラッチレバー等の操作手段に伝わってしまうのを回避することができる。 In addition , when the rotational force input to the input member can be transmitted to the output member, the pressure member and the clutch member relatively rotate and approach each other, so that the drive side clutch plate and the driven side clutch plate A pressure assisting cam that can increase the pressure contact force, or when the rotation of the output member exceeds the number of rotations of the input member, the pressure member and the clutch member are relatively rotated and separated so that the drive side clutch plate and the driven side Since the back torque limiter cam that releases the pressure contact force with the clutch plate is provided, the vibration of the engine or the like is transmitted, the pressure member vibrates in the rotational direction, and the vibration is transmitted to the operating means such as the clutch lever. Can be avoided.

請求項2の発明によれば、プレッシャ部材及びクラッチ部材は、軸方向に嵌合面を有するとともに、当該プレッシャ部材又はクラッチ部材の嵌合面に抵抗部材が配設されたので、プレッシャ部材の操作性に対する影響を抑えつつプレッシャ部材の回転方向の振動を抑制することができる。 According to the second aspect of the present invention, the pressure member and the clutch member have a fitting surface in the axial direction, and the resistance member is disposed on the fitting surface of the pressure member or the clutch member. The vibration in the rotation direction of the pressure member can be suppressed while suppressing the influence on the property.

請求項の発明によれば、プレッシャ部材又はクラッチ部材における当該プレッシャ部材とクラッチ部材との軸方向の合わせ面に抵抗部材が配設されたので、プレッシャ部材がクラッチ部材に対して軸方向に近接した状態で摺動抵抗を生じさせることができるとともに、当該プレッシャ部材がクラッチ部材に対して軸方向に離間した状態においては摺動抵抗を生じさせないものとすることができる。 According to the invention of claim 3 , since the resistance member is disposed on the pressure member or the clutch member in the axial alignment surface of the pressure member and the clutch member, the pressure member is close to the clutch member in the axial direction. In this state, sliding resistance can be generated, and when the pressure member is separated from the clutch member in the axial direction, no sliding resistance can be generated.

請求項の発明によれば、所定寸法を超えてプレッシャ部材がクラッチ部材に対して離間する方向に移動するのを規制する規制部材を具備するとともに、抵抗部材は、プレッシャ部材に配設されて当該規制部材の表面を摺動可能とされたので、クラッチ部材とプレッシャ部材とが組み付けられた状態で抵抗部材を取付け又は交換することができる。 According to the fourth aspect of the present invention, the pressure member is provided with the restriction member that restricts the pressure member from moving in a direction away from the clutch member beyond a predetermined dimension, and the resistance member is disposed on the pressure member. Since the surface of the regulating member is slidable, the resistance member can be attached or exchanged in a state where the clutch member and the pressure member are assembled.

本発明の第1の実施形態に係る動力伝達装置を示す全体縦断面図1 is an overall longitudinal sectional view showing a power transmission device according to a first embodiment of the present invention. (a)同動力伝達装置におけるクラッチ部材を示す平面図(b)クラッチ部材側第1カム面及びクラッチ部材側第2カム面を示す模式図(A) The top view which shows the clutch member in the same power transmission device (b) The schematic diagram which shows the clutch member side 1st cam surface and the clutch member side 2nd cam surface (a)同動力伝達装置におけるプレッシャ部材を示す平面図(b)抵抗部材が取り付けられた状態を示す模式図(A) The top view which shows the pressure member in the same power transmission device (b) The schematic diagram which shows the state in which the resistance member was attached 同動力伝達装置における圧接アシスト用カムの作用を示す模式図Schematic diagram showing the action of the pressure welding assist cam in the power transmission device 同動力伝達装置におけるバックトルクリミッタ用カムの作用を示す模式図Schematic showing the operation of the back torque limiter cam in the power transmission device 本発明の第2の実施形態に係る動力伝達装置を示す全体縦断面図Whole longitudinal cross-sectional view which shows the power transmission device which concerns on the 2nd Embodiment of this invention 本発明の第3の実施形態に係る動力伝達装置を示す全体縦断面図Whole longitudinal cross-sectional view which shows the power transmission device which concerns on the 3rd Embodiment of this invention 本発明の第4の実施形態に係る動力伝達装置を示す全体縦断面図Whole longitudinal cross-sectional view which shows the power transmission device which concerns on the 4th Embodiment of this invention 本発明の第5の実施形態に係る動力伝達装置を示す全体縦断面図Whole longitudinal cross-sectional view which shows the power transmission device which concerns on the 5th Embodiment of this invention

以下、本発明の実施形態について図面を参照しながら具体的に説明する。
第1の実施形態に係る動力伝達装置は、二輪車等の車両に配設されて任意にエンジンの駆動力をミッションや駆動輪側へ伝達し又は遮断するためのダイカスト成形で得られるもので、図1〜3に示すように、入力部材としてのギア1が形成されたクラッチハウジング2と、出力部材としてのシャフト3と連結されたクラッチ部材4と、該クラッチ部材4の図中右端側に形成されたプレッシャ部材5と、クラッチハウジング2側に連結された駆動側クラッチ板6及びクラッチ部材4側に連結された被動側クラッチ板7と、クラッチ部材4に形成されたクラッチ部材側第1カム面4a及びクラッチ部材側第2カム面4bと、プレッシャ部材5に形成されたプレッシャ部材側第1カム面5a及びプレッシャ部材側第2カム面5bと、規制部材10と、抵抗部材11とから主に構成されている。尚、図中符号Sはダンパを示しているとともに、符号Nはニードルベアリングを示している。
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The power transmission device according to the first embodiment is provided in a vehicle such as a two-wheeled vehicle, and is obtained by die casting for arbitrarily transmitting or shutting off the driving force of the engine to the mission or driving wheel side. 1 to 3, a clutch housing 2 in which a gear 1 as an input member is formed, a clutch member 4 connected to a shaft 3 as an output member, and the clutch member 4 is formed on the right end side in the figure. A pressure member 5, a driving side clutch plate 6 connected to the clutch housing 2 side, a driven side clutch plate 7 connected to the clutch member 4 side, and a clutch member side first cam surface 4 a formed on the clutch member 4. And the clutch member side second cam surface 4b, the pressure member side first cam surface 5a and the pressure member side second cam surface 5b formed on the pressure member 5, the regulating member 10, It is mainly a resistor member 11 Prefecture. In the figure, symbol S indicates a damper and symbol N indicates a needle bearing.

ギア1は、エンジンから伝達された駆動力(回転力)が入力されるとシャフト3を中心として回転可能とされたもので、リベットR等によりクラッチハウジング2と連結されている。このクラッチハウジング2は、同図右端側が開口した円筒状のケース部材から成り、その内周壁には複数の駆動側クラッチ板6が取り付けられている。かかる駆動側クラッチ板6のそれぞれは、略円環状に形成された板材から成るとともにクラッチハウジング2の内周面に形成されたスプラインと嵌合することにより、当該クラッチハウジング2の回転と共に回転し、且つ、軸方向(同図中左右方向)に摺動し得るよう構成されている。   The gear 1 is rotatable about the shaft 3 when a driving force (rotational force) transmitted from the engine is input, and is connected to the clutch housing 2 by a rivet R or the like. The clutch housing 2 is formed of a cylindrical case member having an opening on the right end side of the figure, and a plurality of drive side clutch plates 6 are attached to the inner peripheral wall thereof. Each of the drive side clutch plates 6 is made of a plate material formed in a substantially annular shape, and is fitted with a spline formed on the inner peripheral surface of the clutch housing 2, thereby rotating with the rotation of the clutch housing 2, And it is comprised so that it can slide to an axial direction (the left-right direction in the figure).

クラッチ部材4は、クラッチハウジング2内に配設された部材から成るものである。かかるクラッチ部材4の略中央にはシャフト3が貫通しつつスプライン嵌合により当該クラッチ部材4とシャフト3とが連結されており、クラッチ部材4が回転するとシャフト3も回転するよう構成されている。また、クラッチ部材4の外周側面には、その軸方向(同図中左右方向)に延びるスプライン(スプライン嵌合部4c)が形成されており、該スプラインに被動側クラッチ板7が嵌め込まれて取り付けられている。   The clutch member 4 is a member disposed in the clutch housing 2. The clutch member 4 and the shaft 3 are connected to each other by spline fitting while the shaft 3 passes through substantially the center of the clutch member 4, and the shaft 3 is also rotated when the clutch member 4 rotates. Further, a spline (spline fitting portion 4c) extending in the axial direction (left and right direction in the figure) is formed on the outer peripheral side surface of the clutch member 4, and the driven clutch plate 7 is fitted into the spline and attached. It has been.

より具体的には、クラッチ部材4に形成されたスプライン(スプライン嵌合部4c)は、その外周側面における略全周に亘って一体的に形成された凹凸形状にて構成されており、スプラインを構成する凹溝に被動側クラッチ板7が嵌合することにより、被動側クラッチ板7のクラッチ部材4に対する軸方向の移動を許容しつつ回転方向の移動が規制され、当該クラッチ部材4と共に回転し得るよう構成されているのである。   More specifically, the spline (spline fitting portion 4c) formed on the clutch member 4 is formed in a concavo-convex shape integrally formed over substantially the entire circumference on the outer peripheral side surface thereof. When the driven clutch plate 7 is fitted in the groove, the movement of the driven clutch plate 7 in the rotational direction is restricted while allowing the movement of the driven clutch plate 7 in the axial direction relative to the clutch member 4. It is configured to obtain.

かかる被動側クラッチ板7は、駆動側クラッチ板6と交互に積層形成されており、隣接する各クラッチ板6、7が圧接又は圧接力が解放されるようになっている。即ち、両クラッチ板6、7は、クラッチ部材4の軸方向への摺動が許容されており、プレッシャ部材5にて図1中左方向へ押圧されると圧接され、クラッチハウジング2の回転力がクラッチ部材4を介してシャフト3に伝達される状態となり、プレッシャ部材5による押圧を解除すると当該圧接力が解放されてクラッチ部材4がクラッチハウジング2の回転に追従しなくなって停止し、シャフト3への回転力の伝達がなされなくなるのである。   The driven clutch plates 7 are alternately laminated with the drive side clutch plates 6 so that the adjacent clutch plates 6 and 7 are released from pressure contact or pressure contact force. That is, the clutch plates 6 and 7 are allowed to slide in the axial direction of the clutch member 4 and are pressed against each other when pressed by the pressure member 5 in the left direction in FIG. Is transmitted to the shaft 3 via the clutch member 4, and when the pressure member 5 is released, the pressure contact force is released, the clutch member 4 stops following the rotation of the clutch housing 2, and stops. The rotational force is not transmitted to.

プレッシャ部材5は、クラッチ部材4の軸方向(図1中左右方向)に移動が可能とされつつ当該クラッチ部材4の図中右端側の位置に取り付けられ、クラッチ部材4に対する軸方向への移動に伴い駆動側クラッチ板6と被動側クラッチ板7とを圧接させ又は圧接力を解放させ得るものである。より具体的には、プレッシャ部材5は、クラッチスプリング8により同図中左方向へ常時付勢されるとともに、シャフト3の内部には、その軸方向に延びるプッシュロッド9が配設されており、運転者が図示しないクラッチレバー等の操作手段を操作することにより当該プッシュロッド9を同図中右方向へ突出させ、プレッシャ部材5をクラッチスプリング8の付勢力に抗して右方向(クラッチ部材4から離間する方向)へ移動させることができるようになっている。   The pressure member 5 is attached to a position on the right end side in the drawing of the clutch member 4 while being movable in the axial direction (left and right direction in FIG. 1) of the clutch member 4, and moves in the axial direction with respect to the clutch member 4. Accordingly, the drive side clutch plate 6 and the driven side clutch plate 7 can be brought into pressure contact or the pressure contact force can be released. More specifically, the pressure member 5 is always urged to the left in the figure by the clutch spring 8, and a push rod 9 extending in the axial direction is disposed inside the shaft 3, When the driver operates an operation means such as a clutch lever (not shown), the push rod 9 is protruded rightward in the figure, and the pressure member 5 is moved rightward (clutch member 4 against the urging force of the clutch spring 8). In a direction away from the head).

しかして、プレッシャ部材5が右方向へ移動すると、駆動側クラッチ板6と被動側クラッチ板7との圧接力が解かれ、ギア1及びクラッチハウジング2に入力された回転力がクラッチ部材4及びシャフト3へ伝達されず遮断されることとなる。すなわち、プレッシャ部材5は、クラッチ部材4に対する軸方向への移動に伴い駆動側クラッチ板6と被動側クラッチ板7とを圧接又は圧接力を解放させることができるよう構成されているのである。   Thus, when the pressure member 5 moves to the right, the pressure contact force between the drive side clutch plate 6 and the driven side clutch plate 7 is released, and the rotational force input to the gear 1 and the clutch housing 2 becomes the clutch member 4 and the shaft. 3 is cut off without being transmitted. That is, the pressure member 5 is configured to be able to press the driving side clutch plate 6 and the driven side clutch plate 7 or release the pressing force with the movement of the clutch member 4 in the axial direction.

ところで、クラッチ部材4及びプレッシャ部材5には、図2、3に示すように、所定角度勾配した勾配面から成るクラッチ部材側第1カム面4a、クラッチ部材側第2カム面4b、及びプレッシャ部材側第1カム面5a、プレッシャ部材側第2カム面5bがそれぞれ形成されている。しかるに、クラッチ部材側第1カム面4aとプレッシャ部材側第1カム面5aとを対峙させて圧接アシスト用カムを構成するとともに、クラッチ部材側第2カム面4bとプレッシャ部材側第2カム面5bとを対峙させてバックトルクリミッタ用カムを構成している。   By the way, as shown in FIGS. 2 and 3, the clutch member 4 and the pressure member 5 include a clutch member-side first cam surface 4a, a clutch member-side second cam surface 4b, and a pressure member, each of which has a gradient surface inclined by a predetermined angle. A side first cam surface 5a and a pressure member side second cam surface 5b are formed. However, the clutch member side first cam surface 4a and the pressure member side first cam surface 5a are opposed to each other to form a pressure contact assist cam, and the clutch member side second cam surface 4b and the pressure member side second cam surface 5b. The cam for the back torque limiter is configured by facing each other.

圧接アシスト用カムは、クラッチハウジング2(入力部材)に入力された回転力がシャフト3(出力部材)に伝達され得る状態となったときにプレッシャ部材5及びクラッチ部材4が相対的に回転し、これらプレッシャ部材5及びクラッチ部材4が近接することにより駆動側クラッチ板6と被動側クラッチ板7との圧接力を増加させ得るものである。すなわち、クラッチハウジング2(入力部材)に入力された回転力がシャフト3(出力部材)に伝達され得る状態となったとき、図4に示すように、クラッチ部材4がプレッシャ部材5に対してa方向に相対的に回転するので、クラッチ部材側第1カム面4aとプレッシャ部材側第1カム面5aとが当接し、これらカム面のカムの作用により、プレッシャ部材5をb方向に移動させ、駆動側クラッチ板6と被動側クラッチ板7との圧接力を増加させるよう構成されているのである。   In the pressure contact assist cam, when the rotational force input to the clutch housing 2 (input member) can be transmitted to the shaft 3 (output member), the pressure member 5 and the clutch member 4 relatively rotate, When the pressure member 5 and the clutch member 4 come close to each other, the pressure contact force between the driving side clutch plate 6 and the driven side clutch plate 7 can be increased. That is, when the rotational force input to the clutch housing 2 (input member) can be transmitted to the shaft 3 (output member), the clutch member 4 moves a to the pressure member 5 as shown in FIG. Since the clutch member side first cam surface 4a and the pressure member side first cam surface 5a are in contact with each other, the cam of the cam surface moves the pressure member 5 in the direction b. The pressure contact force between the drive side clutch plate 6 and the driven side clutch plate 7 is increased.

バックトルクリミッタ用カムは、シャフト3(出力部材)の回転がクラッチハウジング2(入力部材)の回転数を上回ったときにプレッシャ部材5及びクラッチ部材4が相対的に回転し、これらプレッシャ部材5及びクラッチ部材4が離間することにより駆動側クラッチ板6と被動側クラッチ板7との圧接力の解放を行わせるものである。すなわち、シャフト3(出力部材)の回転がクラッチハウジング2(入力部材)の回転数を上回ったとき、図5に示すように、クラッチ部材4がプレッシャ部材5に対してc方向に相対的に回転するので、クラッチ部材側第2カム面4bとプレッシャ部材側第2カム面5bとが当接し、これらカム面のカムの作用により、プレッシャ部材5をd方向に移動させ、駆動側クラッチ板6と被動側クラッチ板7との圧接力を解放させるよう構成されているのである。   In the back torque limiter cam, when the rotation of the shaft 3 (output member) exceeds the rotation speed of the clutch housing 2 (input member), the pressure member 5 and the clutch member 4 rotate relative to each other. When the clutch member 4 is separated, the pressure contact force between the driving side clutch plate 6 and the driven side clutch plate 7 is released. That is, when the rotation of the shaft 3 (output member) exceeds the rotation speed of the clutch housing 2 (input member), the clutch member 4 rotates relative to the pressure member 5 in the c direction as shown in FIG. Therefore, the clutch member-side second cam surface 4b and the pressure member-side second cam surface 5b come into contact with each other, and the cams on these cam surfaces move the pressure member 5 in the d-direction, The pressure contact force with the driven clutch plate 7 is released.

規制部材10は、所定寸法を超えてプレッシャ部材5がクラッチ部材4に対して離間する方向に移動するのを規制する円環状部材から成るもので、図1に示すように、ボルトBによりクラッチ部材4と連結され、クラッチスプリング8の一端を受けるよう構成されている。なお、クラッチスプリング8の他端は、プレッシャ部材5の所定部位で受けられており、かかるクラッチスプリング8により、プレッシャ部材5がクラッチ部材4に近接する方向に付勢されることとなる。   The restricting member 10 is formed of an annular member that restricts the pressure member 5 from moving in a direction away from the clutch member 4 beyond a predetermined dimension. As shown in FIG. 4 and is configured to receive one end of the clutch spring 8. The other end of the clutch spring 8 is received at a predetermined portion of the pressure member 5, and the pressure member 5 is urged by the clutch spring 8 in a direction approaching the clutch member 4.

ここで、本実施形態においては、プレッシャ部材5及びクラッチ部材4は、軸方向に嵌合して組み付けられる(すなわち、インローにより組み付けられる)とともに、当該プレッシャ部材5又はクラッチ部材4の嵌合面(α、β)のうち本実施形態においてはプレッシャ部材5の嵌合面βに抵抗部材11が配設されている。より具体的には、プレッシャ部材5の嵌合面βにおける所定位置には、図3に示すように、取付凹部5cが形成されており、その取付凹部5cに対して抵抗部材11が圧入等にて固定されているのである。   Here, in this embodiment, the pressure member 5 and the clutch member 4 are fitted and assembled in the axial direction (that is, assembled by an inlay), and the fitting surface of the pressure member 5 or the clutch member 4 ( Among the α, β), in this embodiment, the resistance member 11 is disposed on the fitting surface β of the pressure member 5. More specifically, as shown in FIG. 3, a mounting recess 5c is formed at a predetermined position on the fitting surface β of the pressure member 5, and the resistance member 11 is press-fitted into the mounting recess 5c. It is fixed.

かかる抵抗部材11は、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせるものであり、本実施形態においてはゴム材にて構成されている。すなわち、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、抵抗部材11がクラッチ部材4の嵌合面αを摺動することとなり、その摺動に伴って摺動抵抗が生じるのである。なお、本実施形態においては、プレッシャ部材5の嵌合面βに抵抗部材11を配設しているが、クラッチ部材4の嵌合面αに抵抗部材11を配設するようにしてもよい。   When the pressure member 5 rotates relative to the clutch member 4, the resistance member 11 generates a sliding resistance with respect to the pressure member 5. In the present embodiment, the resistance member 11 is made of a rubber material. Has been. That is, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 11 slides on the fitting surface α of the clutch member 4, and sliding resistance is generated along with the sliding. is there. In the present embodiment, the resistance member 11 is provided on the fitting surface β of the pressure member 5, but the resistance member 11 may be provided on the fitting surface α of the clutch member 4.

次に、本発明の第2の実施形態について説明する。
第2の実施形態に係る動力伝達装置は、先の実施形態と同様、二輪車等の車両に配設されて任意にエンジンの駆動力をミッションや駆動輪側へ伝達し又は遮断するためのダイカスト成形で得られるもので、図6に示すように、入力部材としてのギア1が形成されたクラッチハウジング2と、出力部材としてのシャフト3と連結されたクラッチ部材4と、プレッシャ部材5と、駆動側クラッチ板6及び被動側クラッチ板7と、規制部材10と、抵抗部材12とから主に構成されている。
Next, a second embodiment of the present invention will be described.
The power transmission device according to the second embodiment, as in the previous embodiment, is disposed in a vehicle such as a two-wheeled vehicle and is die-cast molded for arbitrarily transmitting or shutting off the driving force of the engine to the mission or driving wheel side. As shown in FIG. 6, a clutch housing 2 in which a gear 1 as an input member is formed, a clutch member 4 connected to a shaft 3 as an output member, a pressure member 5, and a drive side The clutch plate 6 and the driven clutch plate 7, the regulating member 10, and the resistance member 12 are mainly configured.

また、本実施形態に係る動力伝達装置には、第1の実施形態と同様、圧接アシスト用カムを構成するクラッチ部材側第1カム面4a及びプレッシャ部材側第1カム面5a、バックトルクリミッタ用カムを構成するクラッチ部材側第2カム面4b及びプレッシャ部材側第2カム面5bがそれぞれ形成されている。なお、第1の実施形態と同様の構成要素には、同一の符号を付し、それらの詳細な説明を省略する。   Further, in the power transmission device according to the present embodiment, as in the first embodiment, the clutch member side first cam surface 4a and the pressure member side first cam surface 5a constituting the pressure contact assist cam, and the back torque limiter are used. A clutch member side second cam surface 4b and a pressure member side second cam surface 5b constituting the cam are respectively formed. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and those detailed description is abbreviate | omitted.

ここで、本実施形態においては、プレッシャ部材5及びクラッチ部材4は、軸方向に嵌合して組み付けられる(すなわち、インローにより組み付けられる)とともに、当該プレッシャ部材5又はクラッチ部材4の嵌合面(α、β)のうち本実施形態においてはプレッシャ部材5の嵌合面βに抵抗部材12が配設されている。より具体的には、プレッシャ部材5の嵌合面βにおける所定位置には、図6に示すように、周方向に亘って取付溝5dが形成されており、その取付溝5dに対して抵抗部材12が圧入等にて固定されているのである。   Here, in this embodiment, the pressure member 5 and the clutch member 4 are fitted and assembled in the axial direction (that is, assembled by an inlay), and the fitting surface of the pressure member 5 or the clutch member 4 ( In this embodiment, the resistance member 12 is disposed on the fitting surface β of the pressure member 5 among α, β). More specifically, as shown in FIG. 6, a mounting groove 5d is formed at a predetermined position on the fitting surface β of the pressure member 5 over the circumferential direction, and the resistance member is opposed to the mounting groove 5d. 12 is fixed by press-fitting or the like.

かかる抵抗部材12は、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせるものであり、本実施形態においては円環状のシール部材(例えばOリング等)にて構成されている。すなわち、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、抵抗部材12がクラッチ部材4の嵌合面αを摺動することとなり、その摺動に伴って摺動抵抗が生じるのである。なお、本実施形態においては、プレッシャ部材5の嵌合面βに抵抗部材12を配設しているが、クラッチ部材4の嵌合面αに抵抗部材12を配設するようにしてもよい。   The resistance member 12 generates a sliding resistance with respect to the pressure member 5 when the pressure member 5 rotates relative to the clutch member 4. In the present embodiment, the resistance member 12 is an annular seal member. (For example, an O-ring). That is, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 12 slides on the fitting surface α of the clutch member 4, and sliding resistance is generated along with the sliding. is there. In the present embodiment, the resistance member 12 is disposed on the fitting surface β of the pressure member 5, but the resistance member 12 may be disposed on the fitting surface α of the clutch member 4.

次に、本発明の第3の実施形態について説明する。
第3の実施形態に係る動力伝達装置は、先の実施形態と同様、二輪車等の車両に配設されて任意にエンジンの駆動力をミッションや駆動輪側へ伝達し又は遮断するためのダイカスト成形で得られるもので、図7に示すように、入力部材としてのギア1が形成されたクラッチハウジング2と、出力部材としてのシャフト3と連結されたクラッチ部材4と、プレッシャ部材5と、駆動側クラッチ板6及び被動側クラッチ板7と、規制部材10と、抵抗部材13とから主に構成されている。
Next, a third embodiment of the present invention will be described.
The power transmission device according to the third embodiment, as in the previous embodiment, is disposed in a vehicle such as a two-wheeled vehicle and is optionally die-cast for transmitting or blocking engine driving force to the mission or driving wheel side. As shown in FIG. 7, a clutch housing 2 in which a gear 1 as an input member is formed, a clutch member 4 connected to a shaft 3 as an output member, a pressure member 5, and a drive side The clutch plate 6 and the driven clutch plate 7, the regulating member 10, and the resistance member 13 are mainly configured.

また、本実施形態に係る動力伝達装置には、第1の実施形態と同様、圧接アシスト用カムを構成するクラッチ部材側第1カム面4a及びプレッシャ部材側第1カム面5a、バックトルクリミッタ用カムを構成するクラッチ部材側第2カム面4b及びプレッシャ部材側第2カム面5bがそれぞれ形成されている。なお、第1の実施形態と同様の構成要素には、同一の符号を付し、それらの詳細な説明を省略する。   Further, in the power transmission device according to the present embodiment, as in the first embodiment, the clutch member side first cam surface 4a and the pressure member side first cam surface 5a constituting the pressure contact assist cam, and the back torque limiter are used. A clutch member side second cam surface 4b and a pressure member side second cam surface 5b constituting the cam are respectively formed. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and those detailed description is abbreviate | omitted.

ここで、本実施形態においては、プレッシャ部材5及びクラッチ部材4は、軸方向に嵌合して組み付けられる(すなわち、インローにより組み付けられる)とともに、当該プレッシャ部材5又はクラッチ部材4の嵌合面(α、β)のうち本実施形態においてはプレッシャ部材5の嵌合面βに抵抗部材13が配設されている。より具体的には、プレッシャ部材5の嵌合面βには、図7に示すように、周方向に亘って抵抗部材13が貼着等により取り付けられているのである。   Here, in this embodiment, the pressure member 5 and the clutch member 4 are fitted and assembled in the axial direction (that is, assembled by an inlay), and the fitting surface of the pressure member 5 or the clutch member 4 ( In this embodiment, the resistance member 13 is disposed on the fitting surface β of the pressure member 5 among α, β). More specifically, as shown in FIG. 7, the resistance member 13 is attached to the fitting surface β of the pressure member 5 by sticking or the like over the circumferential direction.

かかる抵抗部材13は、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせるものであり、本実施形態においてはシート状の摩擦材にて構成されている。すなわち、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、抵抗部材13がクラッチ部材4の嵌合面αを摺動することとなり、その摺動に伴って摺動抵抗が生じるのである。なお、本実施形態においては、プレッシャ部材5の嵌合面βに抵抗部材13を配設しているが、クラッチ部材4の嵌合面αに抵抗部材13を配設するようにしてもよい。   The resistance member 13 generates a sliding resistance with respect to the pressure member 5 when the pressure member 5 rotates relative to the clutch member 4. In this embodiment, the resistance member 13 is a sheet-like friction material. It is composed of. That is, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 13 slides on the fitting surface α of the clutch member 4, and sliding resistance is generated along with the sliding. is there. In the present embodiment, the resistance member 13 is disposed on the fitting surface β of the pressure member 5, but the resistance member 13 may be disposed on the fitting surface α of the clutch member 4.

上記第1〜3の実施形態によれば、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせる抵抗部材11〜13を具備したので、プレッシャ部材5のクラッチ部材4に対する相対的な回転を抑制することにより、同方向の振動を抑制することができる。特に、本実施形態においては、圧接アシスト用カム及びバックトルクリミッタ用カムを具備しているので、エンジン等の振動が伝達されてプレッシャ部材5が回転方向に振動し、当該振動がクラッチレバー等の操作手段に伝わってしまうのを回避することができる。   According to the first to third embodiments, when the pressure member 5 rotates relative to the clutch member 4, the resistance members 11 to 13 that cause sliding resistance to the pressure member 5 are provided. Therefore, the vibration in the same direction can be suppressed by suppressing the relative rotation of the pressure member 5 with respect to the clutch member 4. In particular, in the present embodiment, the pressure assisting cam and the back torque limiter cam are provided, so that the vibration of the engine or the like is transmitted and the pressure member 5 vibrates in the rotational direction, and the vibration is transmitted to the clutch lever or the like. It is possible to avoid transmission to the operating means.

また、本第1〜3の実施形態によれば、プレッシャ部材5及びクラッチ部材4は、軸方向に嵌合して組み付けられるとともに、当該プレッシャ部材5又はクラッチ部材4の嵌合面α、βに抵抗部材11〜13が配設されたので、抵抗部材11〜13による摺動抵抗に加えて他の抵抗(例えば圧縮抵抗等)が生じてしまうのを回避でき、プレッシャ部材5の操作性に対する影響を抑えつつプレッシャ部材5の回転方向の振動を抑制することができる。   Further, according to the first to third embodiments, the pressure member 5 and the clutch member 4 are fitted and assembled in the axial direction, and are fitted to the fitting surfaces α and β of the pressure member 5 or the clutch member 4. Since the resistance members 11 to 13 are disposed, it is possible to avoid the occurrence of other resistance (for example, compression resistance) in addition to the sliding resistance due to the resistance members 11 to 13, and the influence on the operability of the pressure member 5. The vibration in the rotational direction of the pressure member 5 can be suppressed while suppressing the above.

次に、本発明の第4の実施形態について説明する。
第4の実施形態に係る動力伝達装置は、先の実施形態と同様、二輪車等の車両に配設されて任意にエンジンの駆動力をミッションや駆動輪側へ伝達し又は遮断するためのダイカスト成形で得られるもので、図8に示すように、入力部材としてのギア1が形成されたクラッチハウジング2と、出力部材としてのシャフト3と連結されたクラッチ部材4と、プレッシャ部材5と、駆動側クラッチ板6及び被動側クラッチ板7と、規制部材10と、抵抗部材14とから主に構成されている。
Next, a fourth embodiment of the present invention will be described.
The power transmission device according to the fourth embodiment, as in the previous embodiment, is disposed in a vehicle such as a two-wheeled vehicle and is optionally die-cast for transmitting or blocking engine driving force to the mission or driving wheel side. As shown in FIG. 8, a clutch housing 2 in which a gear 1 as an input member is formed, a clutch member 4 connected to a shaft 3 as an output member, a pressure member 5, and a drive side The clutch plate 6 and the driven clutch plate 7, the regulating member 10, and the resistance member 14 are mainly configured.

また、本実施形態に係る動力伝達装置には、第1の実施形態と同様、圧接アシスト用カムを構成するクラッチ部材側第1カム面4a及びプレッシャ部材側第1カム面5a、バックトルクリミッタ用カムを構成するクラッチ部材側第2カム面4b及びプレッシャ部材側第2カム面5bがそれぞれ形成されている。なお、第1の実施形態と同様の構成要素には、同一の符号を付し、それらの詳細な説明を省略する。   Further, in the power transmission device according to the present embodiment, as in the first embodiment, the clutch member side first cam surface 4a and the pressure member side first cam surface 5a constituting the pressure contact assist cam, and the back torque limiter are used. A clutch member side second cam surface 4b and a pressure member side second cam surface 5b constituting the cam are respectively formed. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and those detailed description is abbreviate | omitted.

ここで、本実施形態においては、クラッチ部材4におけるプレッシャ部材5とクラッチ部材4との軸方向の合わせ面(プレッシャ部材5とクラッチ部材4とが軸方向で対向する面)に抵抗部材14が配設されている。より具体的には、クラッチ部材4のプレッシャ部材5に対する軸方向の合わせ面(スプライン嵌合部4cの上端面)には、図8に示すように、円環状の取付溝4eが形成されており、その取付溝4eに対して円環状の抵抗部材14が圧入等にて固定されているのである。   Here, in the present embodiment, the resistance member 14 is arranged on the axial alignment surface of the pressure member 5 and the clutch member 4 in the clutch member 4 (the surface where the pressure member 5 and the clutch member 4 face each other in the axial direction). It is installed. More specifically, as shown in FIG. 8, an annular mounting groove 4e is formed on the axial alignment surface of the clutch member 4 with respect to the pressure member 5 (the upper end surface of the spline fitting portion 4c). The annular resistance member 14 is fixed to the mounting groove 4e by press fitting or the like.

かかる抵抗部材14は、プレッシャ部材5がクラッチ部材4に近接した状態で、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせるものであり、本実施形態においては円環状のシール部材(例えば、Oリング等)にて構成されている。すなわち、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、抵抗部材14がプレッシャ部材5との当接面にて摺動し、その摺動に伴って摺動抵抗が生じるのである。なお、本実施形態においては、クラッチ部材4のプレッシャ部材5に対する軸方向の合わせ面に抵抗部材14を配設しているが、プレッシャ部材5のクラッチ部材4に対する軸方向の合わせ面に抵抗部材14を配設するようにしてもよい。   The resistance member 14 generates sliding resistance with respect to the pressure member 5 when the pressure member 5 rotates relative to the clutch member 4 in a state where the pressure member 5 is close to the clutch member 4. In this embodiment, an annular seal member (for example, an O-ring) is used. That is, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 14 slides on the contact surface with the pressure member 5, and sliding resistance is generated along with the sliding. . In this embodiment, the resistance member 14 is disposed on the axial alignment surface of the clutch member 4 with respect to the pressure member 5, but the resistance member 14 is disposed on the axial alignment surface of the pressure member 5 with respect to the clutch member 4. May be arranged.

本実施形態によれば、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせる抵抗部材14を具備したので、プレッシャ部材5のクラッチ部材4に対する相対的な回転を抑制することにより、同方向の振動を抑制することができる。特に、本実施形態によれば、プレッシャ部材5又はクラッチ部材4における当該プレッシャ部材5とクラッチ部材4との軸方向の合わせ面に抵抗部材14が配設されたので、プレッシャ部材5がクラッチ部材4に対して軸方向に近接した状態で摺動抵抗を生じさせることができるとともに、当該プレッシャ部材5がクラッチ部材4に対して軸方向に離間した状態においては摺動抵抗を生じさせないものとすることができる。   According to the present embodiment, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 14 that generates a sliding resistance to the pressure member 5 is provided. By suppressing relative rotation with respect to the member 4, vibration in the same direction can be suppressed. In particular, according to the present embodiment, since the resistance member 14 is disposed on the pressure member 5 or the clutch member 4 on the axial alignment surface of the pressure member 5 and the clutch member 4, the pressure member 5 is the clutch member 4. The sliding resistance can be generated in the state of being close to the axial direction with respect to the pressure member 5, and no sliding resistance is generated when the pressure member 5 is spaced apart from the clutch member 4 in the axial direction. Can do.

次に、本発明の第5の実施形態について説明する。
第5の実施形態に係る動力伝達装置は、先の実施形態と同様、二輪車等の車両に配設されて任意にエンジンの駆動力をミッションや駆動輪側へ伝達し又は遮断するためのダイカスト成形で得られるもので、図9に示すように、入力部材としてのギア1が形成されたクラッチハウジング2と、出力部材としてのシャフト3と連結されたクラッチ部材4と、プレッシャ部材5と、駆動側クラッチ板6及び被動側クラッチ板7と、規制部材10と、抵抗部材15とから主に構成されている。
Next, a fifth embodiment of the present invention will be described.
The power transmission device according to the fifth embodiment, as in the previous embodiment, is disposed in a vehicle such as a two-wheeled vehicle and is optionally die-cast for transmitting or blocking engine driving force to the mission or driving wheel side. As shown in FIG. 9, a clutch housing 2 in which a gear 1 as an input member is formed, a clutch member 4 connected to a shaft 3 as an output member, a pressure member 5, and a drive side The clutch plate 6 and the driven clutch plate 7, the regulating member 10, and the resistance member 15 are mainly configured.

また、本実施形態に係る動力伝達装置には、第1の実施形態と同様、圧接アシスト用カムを構成するクラッチ部材側第1カム面4a及びプレッシャ部材側第1カム面5a、バックトルクリミッタ用カムを構成するクラッチ部材側第2カム面4b及びプレッシャ部材側第2カム面5bがそれぞれ形成されている。なお、第1の実施形態と同様の構成要素には、同一の符号を付し、それらの詳細な説明を省略する。   Further, in the power transmission device according to the present embodiment, as in the first embodiment, the clutch member side first cam surface 4a and the pressure member side first cam surface 5a constituting the pressure contact assist cam, and the back torque limiter are used. A clutch member side second cam surface 4b and a pressure member side second cam surface 5b constituting the cam are respectively formed. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and those detailed description is abbreviate | omitted.

ここで、本実施形態に係る抵抗部材15は、プレッシャ部材5に配設されて規制部材10の表面を摺動可能とされたものであり、図9に示すように、プレッシャ部材5における規制部材10と対向する所定位置に形成された取付凹部5fに圧入等にて固定されるとともに、突端面が規制部材10の表面に当接した状態とされている。この抵抗部材15は、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせるものであり、本実施形態においてはブロック状のゴム材(第1の実施形態における抵抗部材11と同様)にて構成されている。しかして、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、抵抗部材15が規制部材10の表面で摺動し、その摺動に伴って摺動抵抗が生じるのである。   Here, the resistance member 15 according to the present embodiment is disposed on the pressure member 5 and is slidable on the surface of the regulating member 10. As shown in FIG. 9, the regulating member in the pressure member 5. 10 is fixed to the mounting recess 5f formed at a predetermined position opposite to 10 by press-fitting or the like, and the protruding end surface is in contact with the surface of the regulating member 10. The resistance member 15 generates sliding resistance with respect to the pressure member 5 when the pressure member 5 rotates relative to the clutch member 4. In this embodiment, the resistance member 15 is a block-shaped rubber material. (Similar to the resistance member 11 in the first embodiment). Thus, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 15 slides on the surface of the regulating member 10, and sliding resistance is generated along with the sliding.

本実施形態によれば、プレッシャ部材5がクラッチ部材4に対して相対的に回転する際、当該プレッシャ部材5に対して摺動抵抗を生じさせる抵抗部材15を具備したので、プレッシャ部材5のクラッチ部材4に対する相対的な回転を抑制することにより、同方向の振動を抑制することができる。特に、本実施形態によれば、所定寸法を超えてプレッシャ部材5がクラッチ部材4に対して離間する方向に移動するのを規制する規制部材10を具備するとともに、抵抗部材15は、プレッシャ部材5に配設されて当該規制部材10の表面を摺動可能とされたので、クラッチ部材4とプレッシャ部材5とが組み付けられた状態で抵抗部材15を取付け又は交換することができる。   According to the present embodiment, when the pressure member 5 rotates relative to the clutch member 4, the resistance member 15 that generates sliding resistance with respect to the pressure member 5 is provided. By suppressing relative rotation with respect to the member 4, vibration in the same direction can be suppressed. In particular, according to the present embodiment, the pressure member 5 is provided with the restriction member 10 that restricts the pressure member 5 from moving in a direction away from the clutch member 4 beyond a predetermined dimension, and the resistance member 15 is provided with the pressure member 5. Since the surface of the regulating member 10 is slidable, the resistance member 15 can be attached or replaced with the clutch member 4 and the pressure member 5 assembled.

以上、本実施形態について説明したが、本発明はこれらに限定されるものではなく、例えば抵抗部材を任意の材料(ゴム材やOリング、摩擦材の他、摺動抵抗を生じさせ得る任意の樹脂や金属等)とすることができ、或いは任意の形状(円環状のものをブロック状とし又はブロック状のものを円環状のものとする等)とすることができる。また、本実施形態においては、何れも圧接アシスト用カム及びバックトルクリミッタ用カムが形成されているが、何れか一方が形成されたものに適用することができる。なお、本発明の動力伝達装置は、自動二輪車の他、自動車、3輪又は4輪バギー、或いは汎用機等種々の多板クラッチ型の動力伝達装置に適用することができる。 As mentioned above, although this embodiment was described, this invention is not limited to these, For example, resistance members can be made of any material (rubber material, O-ring, friction material, or any material that can cause sliding resistance). Resin, metal, etc.) or any shape (an annular shape is a block shape or a block shape is an annular shape, etc.). In the present embodiment, any but the cam and back-torque cam limiter pressure-contact assisting is formed, can be applied to either be one of which is formed. The power transmission device of the present invention can be applied to various multi-plate clutch type power transmission devices such as automobiles, three-wheel or four-wheel buggies, and general-purpose machines in addition to motorcycles.

プレッシャ部材がクラッチ部材に対して相対的に回転する際、当該プレッシャ部材に対して摺動抵抗を生じさせる抵抗部材を具備した動力伝達装置であれば、外観形状が異なるもの或いは他の機能が付加されたもの等にも適用することができる。   When the pressure member rotates relative to the clutch member, a power transmission device having a resistance member that generates a sliding resistance against the pressure member has a different appearance or has other functions. It can also be applied to those that have been made.

1 ギア(入力部材)
2 クラッチハウジング(入力部材)
3 シャフト(出力部材)
4 クラッチ部材
5 プレッシャ部材
6 駆動側クラッチ板
7 被動側クラッチ板
8 クラッチスプリング
9 プッシュロッド
10 規制部材
11〜15 抵抗部材
1 Gear (input member)
2 Clutch housing (input member)
3 Shaft (output member)
4 Clutch member 5 Pressure member 6 Drive side clutch plate 7 Driven side clutch plate 8 Clutch spring 9 Push rod 10 Restriction member 11-15 Resistance member

Claims (4)

入力部材の回転と共に回転し複数の駆動側クラッチ板が取り付けられるクラッチハウジングと、
前記クラッチハウジングの駆動側クラッチ板と交互に形成された複数の被動側クラッチ板が取り付けられるとともに、出力部材と連結されたクラッチ部材と、
前記クラッチ部材の軸方向に移動が可能とされつつ当該クラッチ部材に取り付けられ、クラッチ部材に対する軸方向への移動に伴い前記駆動側クラッチ板と被動側クラッチ板とを圧接させ又は圧接力を解放させ得るプレッシャ部材と、
前記入力部材に入力された回転力が出力部材に伝達され得る状態となったときに前記プレッシャ部材及び前記クラッチ部材が相対的に回転して近接することにより前記駆動側クラッチ板と被動側クラッチ板との圧接力を増加させ得る圧接アシスト用カム、または出力部材の回転が入力部材の回転数を上回ったときに前記プレッシャ部材及び前記クラッチ部材が相対的に回転して離間することにより前記駆動側クラッチ板と被動側クラッチ板との圧接力の解放を行わせるバックトルクリミッタ用カムと、
を有し、前記駆動側クラッチ板と被動側クラッチ板との圧接又は圧接力の解放により、入力部材に入力された回転力を出力部材に伝達し又は遮断し得る動力伝達装置において、
前記プレッシャ部材が前記クラッチ部材に対して相対的に回転する際、当該プレッシャ部材に対して摺動抵抗を生じさせる抵抗部材を具備したことを特徴とする動力伝達装置。
A clutch housing that rotates with the rotation of the input member and is attached with a plurality of drive side clutch plates;
A plurality of driven side clutch plates formed alternately with the driving side clutch plates of the clutch housing are attached, and a clutch member connected to the output member;
The clutch member is attached to the clutch member while allowing the clutch member to move in the axial direction, and the driving side clutch plate and the driven side clutch plate are brought into pressure contact with each other or released from the pressure contact force as the clutch member moves in the axial direction. A pressure member to obtain,
When the rotational force input to the input member can be transmitted to the output member, the pressure member and the clutch member relatively rotate and approach each other, whereby the driving side clutch plate and the driven side clutch plate A pressure-assist assist cam that can increase the pressure-contact force between the pressure member and the output member when the rotation of the output member exceeds the rotational speed of the input member. A back torque limiter cam for releasing the pressure contact force between the clutch plate and the driven clutch plate;
In the power transmission device capable of transmitting or shutting off the rotational force input to the input member to the output member by releasing the pressure contact or the pressure contact force between the driving side clutch plate and the driven side clutch plate,
A power transmission device comprising: a resistance member that generates sliding resistance with respect to the pressure member when the pressure member rotates relative to the clutch member.
前記プレッシャ部材及びクラッチ部材は、軸方向に嵌合面を有するとともに、当該プレッシャ部材又はクラッチ部材の嵌合面に前記抵抗部材が配設されたことを特徴とする請求項1記載の動力伝達装置。 2. The power transmission device according to claim 1, wherein the pressure member and the clutch member have a fitting surface in an axial direction, and the resistance member is disposed on the fitting surface of the pressure member or the clutch member. . 前記プレッシャ部材又はクラッチ部材における当該プレッシャ部材とクラッチ部材との軸方向の合わせ面に前記抵抗部材が配設されたことを特徴とする請求項1記載の動力伝達装置。   The power transmission device according to claim 1, wherein the resistance member is disposed on an axial alignment surface between the pressure member and the clutch member in the pressure member or the clutch member. 所定寸法を超えて前記プレッシャ部材が前記クラッチ部材に対して離間する方向に移動するのを規制する規制部材を具備するとともに、前記抵抗部材は、前記プレッシャ部材に配設されて当該規制部材の表面を摺動可能とされたことを特徴とする請求項1記載の動力伝達装置。   The pressure member is provided with a restriction member that restricts movement of the pressure member in a direction away from the clutch member beyond a predetermined dimension, and the resistance member is disposed on the pressure member and is disposed on the surface of the restriction member. The power transmission device according to claim 1, wherein the power transmission device is slidable.
JP2011287229A 2011-12-28 2011-12-28 Power transmission device Active JP5995439B2 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP2011287229A JP5995439B2 (en) 2011-12-28 2011-12-28 Power transmission device
BR112014016210-7A BR112014016210B1 (en) 2011-12-28 2012-12-28 POWER TRANSMISSION APPLIANCE
IN1278KON2014 IN2014KN01278A (en) 2011-12-28 2012-12-28
PCT/JP2012/084079 WO2013100130A1 (en) 2011-12-28 2012-12-28 Power transmission device
EP12863436.7A EP2799734B1 (en) 2011-12-28 2012-12-28 Power transmission device
CN201280064286.9A CN104011416B (en) 2011-12-28 2012-12-28 Power transmission device
PH12014501274A PH12014501274A1 (en) 2011-12-28 2014-06-06 A power transmitting apparatus
US14/317,240 US9371867B2 (en) 2011-12-28 2014-06-27 Power transmitting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011287229A JP5995439B2 (en) 2011-12-28 2011-12-28 Power transmission device

Publications (2)

Publication Number Publication Date
JP2013137039A JP2013137039A (en) 2013-07-11
JP5995439B2 true JP5995439B2 (en) 2016-09-21

Family

ID=48697607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011287229A Active JP5995439B2 (en) 2011-12-28 2011-12-28 Power transmission device

Country Status (8)

Country Link
US (1) US9371867B2 (en)
EP (1) EP2799734B1 (en)
JP (1) JP5995439B2 (en)
CN (1) CN104011416B (en)
BR (1) BR112014016210B1 (en)
IN (1) IN2014KN01278A (en)
PH (1) PH12014501274A1 (en)
WO (1) WO2013100130A1 (en)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6516756B2 (en) * 2014-08-12 2019-05-22 株式会社エフ・シー・シー Power transmission
JP6352756B2 (en) * 2014-09-30 2018-07-04 株式会社シマノ Torque limiting device for fishing reel
JP6376662B2 (en) 2015-05-12 2018-08-22 株式会社エフ・シー・シー Power transmission system for vehicles
JP6501354B2 (en) * 2015-05-12 2019-04-17 株式会社エフ・シー・シー Power transmission system for vehicles
US9951824B2 (en) * 2016-01-13 2018-04-24 Tti (Macao Commercial Offshore) Limited Self-engaging clutch
JP6603143B2 (en) * 2016-01-25 2019-11-06 株式会社エフ・シー・シー Power transmission device
EP3546781B1 (en) 2016-12-29 2022-05-04 Yamaha Hatsudoki Kabushiki Kaisha Clutch drive device and vehicle
CA3047906C (en) 2016-12-29 2021-03-30 Yamaha Hatsudoki Kabushiki Kaisha Clutch drive device and vehicle
CA3047713C (en) * 2016-12-29 2020-12-29 Yamaha Hatsudoki Kabushiki Kaisha Clutch unit and vehicle
DE102017106870B3 (en) * 2017-03-30 2018-09-13 Schaeffler Technologies AG & Co. KG Coupling basket assembly with a primary gear and a projecting into this impression of a counter-plate or a disc
JP2018189106A (en) * 2017-04-28 2018-11-29 ヤマハ発動機株式会社 Clutch device, and saddle type vehicle and vehicle including the same
JP6498722B2 (en) 2017-06-01 2019-04-10 株式会社エフ・シー・シー Clutch device
JP6894792B2 (en) * 2017-07-27 2021-06-30 株式会社エフ・シー・シー Power transmission device
JP6502443B2 (en) * 2017-09-01 2019-04-17 株式会社エフ・シー・シー Power transmission
JP6961427B2 (en) * 2017-09-01 2021-11-05 株式会社エフ・シー・シー Power transmission device
JP6553696B2 (en) 2017-10-26 2019-07-31 株式会社エフ・シー・シー Clutch device
US10753425B2 (en) * 2017-11-02 2020-08-25 Schaeffler Technologies AG & Co. KG Internal rotor damper modular hybrid transmission
JP7161285B2 (en) * 2017-11-10 2022-10-26 株式会社エクセディ clutch device
JP7217588B2 (en) * 2018-01-11 2023-02-03 株式会社エフ・シー・シー power transmission device
JP6903020B2 (en) 2018-01-11 2021-07-14 株式会社エフ・シー・シー Power transmission device
DE102018103839A1 (en) 2018-02-21 2019-08-22 Schaeffler Technologies AG & Co. KG friction clutch
JP6851340B2 (en) * 2018-03-14 2021-03-31 株式会社エクセディ Clutch device
JP6731436B2 (en) * 2018-03-19 2020-07-29 株式会社エクセディ Power transmission device
CN108708916A (en) * 2018-06-25 2018-10-26 重庆隆鑫发动机有限公司 Slip-clutch, engine and its motorcycle
JP7209521B2 (en) 2018-12-05 2023-01-20 株式会社エフ・シー・シー power transmission device
JP6596180B2 (en) * 2019-03-08 2019-10-23 株式会社エフ・シー・シー Clutch device
JP7429485B2 (en) 2019-10-01 2024-02-08 株式会社エフ・シー・シー clutch device
IT202000005533A1 (en) * 2020-03-16 2021-09-16 Piaggio & C Spa CLUTCH
WO2024009773A1 (en) * 2022-07-05 2024-01-11 株式会社エフ・シー・シー Clutch device
JP7481420B2 (en) 2022-07-05 2024-05-10 株式会社エフ・シー・シー Clutch device
JP7252405B1 (en) * 2022-09-28 2023-04-04 株式会社エフ・シー・シー Clutch device and motorcycle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3378097B2 (en) * 1994-09-29 2003-02-17 本田技研工業株式会社 Friction clutch
JP4527055B2 (en) * 2005-12-28 2010-08-18 株式会社エフ・シー・シー Power transmission device
JP4452301B2 (en) * 2007-09-12 2010-04-21 株式会社エフ・シー・シー Power transmission device
JP4922226B2 (en) * 2008-03-28 2012-04-25 本田技研工業株式会社 Vehicle clutch
JP5198188B2 (en) * 2008-08-29 2013-05-15 本田技研工業株式会社 Oil passage for wet multi-plate clutch
JP5227229B2 (en) 2009-03-23 2013-07-03 株式会社エフ・シー・シー Power transmission device

Also Published As

Publication number Publication date
IN2014KN01278A (en) 2015-10-16
US9371867B2 (en) 2016-06-21
EP2799734A1 (en) 2014-11-05
US20140326570A1 (en) 2014-11-06
BR112014016210A2 (en) 2017-06-13
BR112014016210B1 (en) 2021-08-03
EP2799734B1 (en) 2019-08-21
WO2013100130A1 (en) 2013-07-04
EP2799734A4 (en) 2016-07-27
PH12014501274B1 (en) 2014-09-15
CN104011416B (en) 2017-05-17
BR112014016210A8 (en) 2017-07-04
JP2013137039A (en) 2013-07-11
CN104011416A (en) 2014-08-27
PH12014501274A1 (en) 2014-09-15

Similar Documents

Publication Publication Date Title
JP5995439B2 (en) Power transmission device
JP6890150B2 (en) Power transmission device
JP6388351B2 (en) Power transmission device
JP4527055B2 (en) Power transmission device
JP5502507B2 (en) Power transmission device
JP4452301B2 (en) Power transmission device
JP5879094B2 (en) Power transmission device
TWI769277B (en) power transmission
JP6603143B2 (en) Power transmission device
JP4344396B2 (en) Power transmission device
JP2009063023A (en) Power transmission device
JP6961427B2 (en) Power transmission device
JP6502443B2 (en) Power transmission
JP4364170B2 (en) Power transmission device
JP4669359B2 (en) Power transmission device
JP2007205387A (en) Power transmission device
JP5227229B2 (en) Power transmission device
JP7149827B2 (en) power transmission device
JP7217588B2 (en) power transmission device
JP5324345B2 (en) Power transmission device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140909

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20150715

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150903

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160224

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160318

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20160801

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20160823

R150 Certificate of patent or registration of utility model

Ref document number: 5995439

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250